Track sander



H. VISSERING TRACK SANDER Nov. 12, 1929.

VFiled oct. s. 1925 ZZZUSNOW f MM Patented Nov. 12, y1929 UNITED STATES HARRY VISSERING, OF KENILWORTH, ILLINOIS TRACK SANDER Application filed October 3, 1,925.y Serial No. 60,139.

The invention relates to track sanders and more particularly to Sanders of the type in which the sand is lifted out of the trap chamber and to a delivery passage by an air blast nozzle.

The object of the present invention is to provide a sander of this type which embodies means of an improved character for maintaining regular and constant movement of the sand within range of the lifting force of the air blast.

In practice, it has been found that sand fed by gravity into the trap will, for example, when it becomes unduly packed, lump or has a tendency to cake in the trap-chamber and` offers an undue resistance to the action of the air blast, so that the delivery of the sand will be irregular or unreliable. The invention overcomes this objection by providing in the bottom of the sander-casing an air inlet for the trap chamber. The air blast created by the nozzle operates to suck suiicient air through this air inlet to disintegrate or agitate the sand and consequently the blast rinsures and effects a regular and constant delivery of sand from the trap, it being manifest that said air blast acts as an aspirator which draws air through the sand to disintegrate it and that the air admitted through the air inlet assists the blast in lifting the sand out of the trap and to the point where it will pass beyond the nozzle where it will be subject to direct propelling force of the air blast.

The invention consists in the several novel features hereinafter set forth and more particularly defined by the claim at the conclusion hereof.

In the drawing: Fig. 1 is a front elevation of a sand trap embodying the invention. Fig. 2 is a section through the trap chamber. Fig. 3 is a section taken on line 3-3 of Fig. 1. Fig. 4 is a transverse section showing the trap connected to a sand box.

The invention is exemplified in a sand trap comprising a casing 7 which is provided with lugs 8 for throughbolts, whereby it may be attached to a sand box 9, which is provided with a downwardly inclined outlet 10 through which sand will fall by gravity from the supply in the box. Suitable packing 28 is usually interposed between the casing 7 and the outlet of the sand box to form a tight connection therebetween. Casing 7 is provided with an inlet 11 which registers with the outlet 10 of the box, so that the sand fromthe 555.

out-let will fall b gravity into a pocket or trap chamber 12 ormed in the lower portion of the casing. Outlet 10 and inlet 11 are inclined downwardly, so that the sand will flow by gravity into, and partially fill, the p,

chamber 12. The casing is provided with an upward extension 13 which contains an upwardly inclined prolongation of the chamber 12. A pipe .14 kfor delivering sand to one or more wheelsis screw-threaded to the front wall 15 of the casing.v A nozzle 16 is threaded `to back-wall 17 of the easing, andis provided with a port 18, which is directed to deliver a blast of air into the delivery pipe 14. A re ceiving chamber 19 is formed in an'integral 70- portion of the casing, and a supply pipe 20, which is connected to receive .compressed air from a suitablesource, is Connected t0 deliverr the air into the chamber 19, so that a blast of air will be discharged through nozzle i 16 and into the delivery pipe 14. The back wall of chamber 19 is fitted with a screw plug 21 tor permit the insertion and removal ofthe nozzle 16. rllhe front wall 15 of the casing is equipped with a screw-plug 22 to g0--` provide access tothe trap-chamber and the sand therein. An air inlet 24 extends through the bottom wall of the casing to permit air under atmospheric pressure to enter the trap chamber and a hood 25 is extended 35\ over the inlet to prevent the sand in cham-y ber 12 from escaping through inlet 24. The hood forms a forwardly extending duct 26 which is open at its front end to the trap chamber. and the hood 25 are forwardly and downwardly sloped, so that the sand in the ytrap will not gravitate into the duct 26. The air entering through inlet 24 under hood 25 will pass into the ylower or that portion of the trap into which the sand is fed by gravity, so that the entry of the air will be limited by the column of sand maintained in the trap. A screwplug 27 is fitted in the front wall 15 of the casing in alignment with the hooded The bottom of the trap chamber 90 portion of the air inlet 24, so as to provide access thereto When desired.

In operation, the air blast from nozzle 16 will subject the trap chamber to suction to litt the sand troni the chamber into the delivery pipe. This suction will cause air in limited volume to enter the trap chamber through inlet 24, so that the device will, in eii'ect, aet as an aspirator, in which the air will tend to disintegrate, as Well as lift the sand to the upper portion of the trap-chamber Where it Will pass in the path of the blast from nozzle 16 and be delivered through pipe 14 to its desired point of use.

The invention exemplilies a sand trap in which a blestnozzle is provided for lifting the sand "from the trap to the delivery pipe, and in which provision is made for loosening and lifting the sand by aspiration, so that a regular and predetermined delivery of the sand will result, ydespite any packing or irregularity in the sand.

The invention is not to be understood as l restricted to the details set forth, since these may be modified Within the scope of the appendedV ola-iin, Without departing from the spirit and scope of the invention.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent, is:

A sander Comprising a casing having a trap chamber therein connected to receive sand by gravity from a suitable supply, an air jet applied to draw sand from' the trap :by suction'7 said casing being provided With an inlet duct in communication with the trap and whereby air Will be admitted into the trap, when the latter is subjected to suction, to disintegrate or agitate the sand therein, and a. hood in the trap and extending over the duct to prevent sand from escapingA through the latter, said hood being formed integrally withy the easing.

Signed at Chicago, Illinois, this 29th day of September, 1925.

HARRY VISSERING. 

